Valve mechanism for internal-combustion engines



May 22, 1928.

R. W. A. BREWER VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES FiledMarch 9, 1925 a i 7' 3 M l L y .M if L FIJUF; -ltllm l r i 0 p J 0 z h.Jlm, 4 fl ll m W flul HE Z k k. l h 3 n MN\\\ /v/ 5 1/ 1H -NJ 2T I 7 MM 1 w a W m fi Iq f z m m 1 Z: "w" s z 0 mv -1 N l u 3 Z w 1 Z l v a N 1z m ATTORNEYS Patented May 22,

UNITED STATES 1,670,876 PATENT OFFICE." 1

ROBERT W.,A. BREWER, or PH LA ELP IA, PENNSYLVANIA, ASSIGNOR TQ'HARQLDr. PITCAIRN, OF BRYN'ATHYN, PENNSYLVANIA.

VALVE MECHANISM ron INTERNAL-COMBUSTION ENGI ES.

Application filed March a, 1925; Serial No. 13,992.

The main objects of this invention are 1. To provide alight and flexiblesleeve, valve of novel construction for an internal combustion engine,which can be made easily and cheaply in the form of a metal pressing. 2.To construct this novel valve so that t can be mounted in the engineeasily. and cheaply.

8.10 provide a head withan ample supply of water from p the cylinderjackets and toutilize the water-v carrying element as a locating andfixing means for the cylinder head closlng member,

and lastly at. To arrange the ports so that thecyhnder heud,.thewater-carrying element andthe "cylinder head closure elementshall bevfirmly tied together in. a simple manner and the casting forming thebridges between the W port openings will be relieved to a great ex-.

tent from the stresses caused by theburning of gases inside thecylinder. 1

According to this invention, m an nternal combustion engine thevalvemember con sists of a cup-shaped presslng, the outer circumicrenceof which makes contact with the cylindrical portion of the bore of thecombust-ion chamber. This cylindrical portion is preferably providedwith saw cutsor cor-* H line 6.6. F 1g. 7 1s a perspective view ofrugations not herein shown but described in a contemporaneously pendingpatent application tiled by me, and it may be further provided withcircumferential slots or openings to suit the requirements of the portarrangement of the engine to which my novel valve mechanism is adapted,my present in-- vention consisting in the. practical .application ofthis novel valvular construction so that it can be put intocommercial.usage in; quantity production. A furtherfeature of; I

construction having the closed top upon my present invention consists-intheuse of a hollow, metal bridge p ece attached tothe valve memberhasbeen placed in position over the closure plug, the bridge piece is:

then inserted through the transverse opening in the valve member andscrewed to the closure plug and the complete unit mounted on thecylinder head and held firmly thereto by studs or screws, which passthrough the cylnder head and screw firmly into the lower face thereof,thus transmitting the working stresses directly to the cylinder headface watercooled cylinder" andrelieving the cast iron of the port con-:frtrruction from tension. The actuation of the valve can be carried.outby any known means, such as the usual cam actuated tap- I pet andlever, acting in both directions or in one direction with a springreturn, which is unnecessary to describe in detail. The

valve can also beactuated by directcam con tact described in Patent No.1,439,894.

For the purpose of illustrating my invention, I have shown in theaccompanyingdrawings forms thereotwhich are at present pi'e'lcrred' byme, since they will give in practice satisfactory and reliable results,-

althoug'h itisto be understood that the various instrume-ntalities ofwhich my invention consists can be variously arranged and organized andthat my invention is not limited to the precise arrangement andorganization of these instrumentalities as herein shown and described. Y

Reterrmg to the accompanying drawings,

Fig. 1 is an elevation of my novel valve, 8.

portion being taken away. Fig. 2 is a section on line :2.2 of Fig. 8.Fig.3 1s a top plan ot the valveini position on the cylinder head: Fig.l is a half elevationof the bridge piece. Fig. 5 is a bottom planv viewof Fig. 4. Fig. 6 is a section of Fig. 4 011 H my novelval'vcin'detached position. Fig. 8 s a vertical section on line 88 ofFig. 2 with the valve removed. F '9 is a part section on line 99 of Fig..3 through the center of the valve in position with the water-carryingbridge piece in elevation. In

these drawings similar numbers apply to,

similar parts. y y .1 deslgnates my novel va1ve,which-may be formedas apressing or otherconvenient which is an extension-orv eye 2, formingonemeansiot attachment to any suitable oper-.

ating means. 3 is the skirt of the valveito WhlClllS imparted a degree,of. flexibility by reason of thelongitudijnal saw cut'sor openings 6,which extend from the bottom of thevalve upwardly. '4 designatestransverse;

ports cut through the wall-of the valve 1, ad-

.The exhaust port 8, is uncovered by the port 4:, in the valve, when thevalve is reciprocated downwards] These ports lead respeesis sition.

'to the exhaust gases, because the joint between the cylinder head andthe cylinder proper can thereby be. kept cooler and relieved ofpractical difficulties which frequently occur in keeping such a jointtight.

under extremes of temperature which may occur, were the functions of thetwo passages, 10 and 11, reversed. In my present invention, the commonwall between the inlet and exhaust passages serves to assist in thevaporizing of the fuel and the fiat floor of the inlet passage furtherassists the fiow of fuel to the engine in a desirable manner. The bridgepiece 12, is preferably constructed as a hollow, rectangular boxsuitably secured to the main casting of the cylinder head and providedwith an externally threaded plug or extension 17, adapted for firmattachment to the cylinder head closure member 14, and acting as a waterconduit through passage 16, between water chamber 21, of said member 11, and the water jacket 22, of the cylinder head 20. As an alternativeconstruction, these two members, 12 and 14:, may be faced, flanged, andattached to one another by screws. The portion of the closure plug 14,which is shown at 19, serves to retain the pressure sealing ring 15, inpo- It further provides an abutment upon the member 12, close to theholding down studs 13, which pass through the openings 1.8, so thatdirect thrust upon the head 14, is transmitted to the studs 18, withoutcausing undue bending stresses in the member 12.

Lubrication of the mechanism is provided by permitting the valve in itsdownward movement to overrun a portion of the cylinder bore and pick upexcess oil which has passed along the cylinder walls above the pistontravel.

It will be apparent from the foregoing that my novel valve and itsadjuncts, can be cheaply constructed, and readily mounted with respectto the engine, and that the cooling elements can also be readilyassembled and will function effectively for the purposes intended.

.Having thus described my invention, what I claim as new and desire tosecure by Let ters Patent, is

1. In an internal combustion engine, a cylinder head havingcircumferential ports therein, a flexible metallic sleeve valve slidablymounted within said cylinder head to control said ports, a cylinder headclosure plug within said valve, a hollow br1dge piece passingtransversely through said valve and attached to said plug therebypermitting limited axial movement of said 'valve with respect to saidplug and bridge piece, means for attaching said bridge piece to saidcylinder head and means for reciprocating said valve.

2. In an internal combustion engine, a cylinder head havingcircumferential ports therein, a comparatively flexible curvilinearvalve positioned in said head and juxtaposed to said ports, a hollowcylinder head closure plug within said valve, means for conducting waterto said hollow plug, comprising a supporting bridge piece for contactingwith the outer rim of said closure plug and means for reciprocating saidvalve.

3. In an internal combustion engine, a cylinder head havingcircumferential ports therein, a water jacket therefor, a curvi= linearvalve controlling said ports, said valve comprising a flexible,dome-shaped cylinder, openings disposed around said cylinder head, awater cooled bridge piece passing through said openings, a water cooledcylin- 1 ring in position in the upper end of said plug, means forsecuring said bridge piece to the cylinder head water jacket and meansfor reciprocating said valve. I

5. In an internal combustion engine, a cylinder head having acircumferential port therein, a Water jacket therefor, a, curvi linearvalve controlling said port, a hollow bridge piece, a hollow cylinderhead closure member juxtaposed to said hollow bridge piece and attachedthereto,.mcans for seeuring'said bridge piece to the water jacketv ofthe cylinder head, said means comprising screw members passing throughsaid bridge piece and through passages in the cylinder head and securedto bosses. formed on the solid metal of thevwalls of the structure andmeans for reciprocatin said valve.

ROBERT w. A. BREWER.

